A few years ago, a friend called me about a "can't-miss" rental property. Nice neighborhood, solid rent, good tenants. When I asked what the cap rate was, the line went quiet.

That's when I realized how many landlords buy properties without ever running this number. Some get lucky. Others end up owning a headache disguised as an investment.

Cap rate is one of the most useful numbers in real estate investing and one of the most misunderstood. Here's what it actually means, how to calculate it correctly, and what different cap rates tell you in 2026.

What does cap rate mean?

Cap rate, short for capitalization rate, is the return a rental property would generate if you purchased it with cash and had no mortgage. It's calculated by dividing the property's net operating income by its purchase price.

The "no mortgage" part is important. Cap rate strips out the effect of financing, which makes it useful for comparing properties and markets regardless of how they're purchased. A property with a high cap rate generates more income relative to its price than a property with a low cap rate.

Cap rate is most useful as a comparison tool, not an absolute verdict on whether a property is good or bad. A 6% cap rate in one market might be excellent. The same 6% in another market might mean the property is overpriced.

How to calculate the cap rate on a rental property

The formula has two steps.

Step 1: Calculate Net Operating Income (NOI)

NOI = Annual gross rental income minus operating expenses

Operating expenses include property taxes, insurance, property management fees, maintenance and repairs, utilities if landlord-paid, and a vacancy allowance. Operating expenses do not include mortgage payments or depreciation.

Step 2: Divide NOI by the property value

Cap rate = NOI divided by property value, multiplied by 100

The result is expressed as a percentage.

Worked example: calculating cap rate

A property is listed at $300,000 and rents for $2,200/month ($26,400/year).

Expense
Annual amount
Property taxes
$3,600
Insurance
$1,200
Maintenance reserve
$2,400
Vacancy (8%)
$2,112
Total expenses
$9,312

NOI = $26,400 minus $9,312 = $17,088

Cap rate = $17,088 divided by $300,000 multiplied by 100 = 5.7%

A commonly searched example: "If a property's value is $200,000 and it's earning a net operating income of $40,000, what is the cap rate?"

The answer: $40,000 divided by $200,000 multiplied by 100 = 20%. A 20% cap rate would be extraordinarily high for a residential rental property. It would suggest the property is dramatically underpriced, the income is temporarily inflated, or there are significant unreported expenses.

What is a good cap rate for a rental property?

There's no single answer. It depends on the market, property type, and your investment goals. Here are the generally accepted ranges as of 2026:

Cap rate range
What it typically signals
Below 4%
Low-yield, appreciation-driven market. Prime urban locations, high demand. Investors accept lower income for strong equity growth.
4% to 6%
Moderate yield. Common in desirable suburban markets. Reasonable income with some appreciation potential.
6% to 8%
Strong cash flow market. Good income yield. Common in the Midwest and Southeast markets.
8% to 10%
High cash flow. Often in markets with slower appreciation, higher vacancy, or more risk.
Above 10%
Very high yield. Investigate why. Could be a distressed property, a declining market, or a rare genuine deal.

The rule of thumb most experienced investors use: a cap rate of 5% to 8% is generally considered acceptable for a well-located residential rental property in a stable market. Context matters more than the number itself.

A useful way to think about the cap rate is in terms of the payback period. A 5% cap rate means it would take roughly 20 years to recoup your purchase price from NOI alone. A 10% cap rate gets you there in about 10 years. This isn't a decision rule, but it's a quick way to gut-check whether a deal makes intuitive sense.

What does a 7.5% cap rate mean?

A 7.5% cap rate means the property generates a net operating income equal to 7.5% of its purchase price each year, assuming you bought it with cash.

Concretely: if you paid $200,000 cash for a property with a 7.5% cap rate, you'd expect to earn $15,000/year in NOI.

A 7.5% cap rate is considered quite good for a residential rental property in most US markets in 2026. It's more common in cash flow-oriented markets like the Midwest and parts of the Southeast than in coastal or high-growth markets. Whether it's good enough depends on your expectations for appreciation. In a market with strong rent growth, a 5% cap rate might be the better long-term hold.

What does a 4%, 5%, 6%, or 7% cap rate mean?

What does a 4% cap rate mean?

A 4% cap rate indicates a property where the income yield is relatively low compared to the price. This is common in strong-demand urban markets where buyers are paying for location and appreciation potential rather than immediate cash flow.

What does a 5% cap rate mean?

A 5% cap rate is on the lower end of acceptable for most cash flow investors, but is normal in desirable suburban markets and many major US cities. It means you'd earn $5 in NOI for every $100 of property value. Whether this works depends on your financing costs and income goals.

What does a 6% cap rate mean?

A 6% cap rate is generally considered solid for a residential rental property. It indicates a reasonable income yield without being so high that it raises questions about the property or market.

Is a 6 cap rate good?

Yes. A 6% cap rate is a good cap rate for a residential rental property in most US markets. It's a reasonable balance between income yield and property quality.

What does a 7% cap rate mean?

A 7% cap rate is strong for a residential rental. Properties at this level are often found in secondary and tertiary markets or Class B and C properties in larger cities. Good cash flow, but worth examining the market fundamentals before buying.

Cap rate vs cash-on-cash return vs IRR: what's the difference?

Cap rate is just one angle. Here's how three common metrics work together on the same deal.

Cap rate tells you the property's yield independent of financing. Useful for comparing properties and markets on equal footing. Ignores your mortgage entirely.

Cash-on-cash return measures the cash income you receive relative to the cash you actually invested: your down payment and closing costs. It shows how your specific financing affects your return.

Example: a property with a 6% cap rate might produce a 9% cash-on-cash return if you put 20% down and your mortgage rate is below the cap rate. Leverage amplifies the return on actual cash invested.

IRR (Internal Rate of Return) takes the longest view. It accounts for all cash flows over the entire holding period: rental income, mortgage payments, and the eventual sale price. It's the most complete picture of investment performance.

Here's how all three look on the same property. You buy a duplex for $300,000, putting $60,000 down. The cap rate is 6%. After mortgage payments, your annual cash flow is $4,200, giving you a 7% cash-on-cash return. Five years later you sell for $375,000. When you account for all the rental income plus the sale profit, the IRR comes out to 13.5%.

Cap rate told you the property was reasonable. Cash-on-cash told you what it put in your pocket monthly. IRR told you how good the decision actually was. All three together give you the complete picture.

Use cap rate to evaluate and compare properties at a glance. Use cash-on-cash to evaluate whether your specific financing makes the deal work. Use IRR when you want to understand the full return over time.

Typical cap rates by market (2026)

These are general ranges based on market data and investor experience. Individual properties vary significantly.

Market type
Typical cap rate range
Gateway cities (NYC, LA, SF, Seattle)
3% to 5%
Major metro suburbs
4% to 6%
Secondary cities (Atlanta, Phoenix, Nashville)
5% to 7%
Midwest cash flow markets (Cleveland, Indianapolis, Memphis)
6% to 9%
Tertiary markets and small towns
7% to 12%+

Note: these are residential rental property ranges. Commercial real estate cap rates work differently.

What cap rate doesn't tell you

Cap rate is a useful starting point with real limitations. It doesn't account for:

  • Financing costs. Two investors in the same property with different mortgage rates will have very different actual returns. Cap rate ignores this entirely.
  • Appreciation. A property with a 4% cap rate in a market with 8% annual appreciation may be a far better long-term investment than a 7.5% cap rate property in a flat market.
  • Capital expenditures. Major capex items like a new roof or HVAC replacement can significantly impact actual returns in ways a snapshot NOI doesn't capture.
  • Vacancy risk. A 5% vacancy assumption in the NOI calculation may be optimistic in some markets or during economic downturns.
  • Rent trends. Cap rate is a snapshot at the time of purchase. If rents are growing rapidly, a 5% cap rate today might look like a 7% cap rate in three years.

The best investors use cap rate as one input in a broader analysis alongside cash-on-cash return, IRR, actual market data, property condition assessments, and local economic fundamentals.

Run cap rate in seconds with the FourCasa Property Evaluator

Calculating cap rate manually means gathering rent estimates, expense figures, and vacancy data for every property you're considering. The FourCasa Property Evaluator does this automatically.

Enter a property address and the tool pulls public data on the property, lets you input rent and expense assumptions, and instantly returns cap rate, cash-on-cash return, and NOI. You can adjust purchase price, rent, and financing terms to run scenarios side by side.

Try the free Property Evaluator

Know your actual NOI, not just estimates

A cap rate is only as accurate as the NOI behind it. FourCasa tracks every expense across every property automatically, so your NOI figures are based on real numbers rather than guesses.

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